I went with the Tunze Osmolator and couldn't be happier. It has an optical sensor along with a backup float switch for extra safety. The JBJ just have float switches. While I have heard plenty of good things about JBJ, I have also heard some not so good things while I have never personally heard any complaints about the Tunze Osmolator. You also would need to buy a pump. You get exactly what you pay for in terms of quality. Good luck!